Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 205 · 40 questions

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

1. 1.710 × ? = 7100
2. 2.9 × 4 = ?6 — what is the missing digit?
3. 3.12345679 × 54 =
4. 4.15 × 4 =
5. 5.15 × 100 =
6. 6.13 × 1000 =
7. 7.43 × 1000 =
8. 8.Magic square (every row, column and diagonal has the same total): ? 9 14 | 11 13 15 | 12 17 10. What is the missing number?
9. 9.9 × 1 =
10. 10.1 + 3 + 5 + … + 27 =
11. 11.Odd one out: which number is NOT in the 7 times table? (a) 35 (b) 42 (c) 20 (d) 28
12. 12.31 × 4 =
13. 13.35 × 4 =
14. 14.6 × 4 =
15. 15.6 × 9 =
16. 16.1234567 × 9 + 8 =
17. 17.Do the 1089 trick with 127: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
19. 19.111 × 111 =
20. 20.If today is Tuesday, what day will it be after 39 days? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
21. 21.Double 24 =
22. 22.9 × 3 = 2? — what is the missing digit?
23. 23.Magic square (every row, column and diagonal has the same total): ? 5 6 | 3 7 11 | 8 9 4. What is the missing number?
24. 24.9 × 8 = 7? — what is the missing digit?
25. 25.Odd one out: which number is NOT in the 4 times table? (a) 28 (b) 19 (c) 8 (d) 16
26. 26.If today is Sunday, what day will it be after 35 days? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
27. 27.35 × 1000 =
28. 28.10 × 9 =
29. 29.The 5th of a month is a Wednesday. What day is the 17th of the same month? (a) Thursday (b) Monday (c) Sunday (d) Tuesday
30. 30.1 + 2 + 3 + … + 19 =
31. 31.9 × 4 =
32. 32.The 1st of a month is a Wednesday. What day is the 29th of the same month? (a) Tuesday (b) Saturday (c) Thursday (d) Wednesday
33. 33.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 34 (c) 36 (d) 38
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
35. 35.9 × 3 =
36. 36.92 × ? = 920
37. 37.Half of 32 =
38. 38.The ages of two twins add up to 10. How old is each twin?
39. 39.37 × 27 =
40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?

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